BTU per Square Foot Calculator

BTU Load Formula:

\[ Q = A \times \text{BTU/ft}^2 \]

Total BTU Load (BTU/h):

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1. What is a BTU per Square Foot Calculator?

Definition: This calculator estimates the heating or cooling load in BTUs based on area and BTU requirements per square foot.

Purpose: It helps HVAC professionals and homeowners determine the appropriate heating or cooling capacity needed for a space.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q = A \times \text{BTU/ft}^2 \]

Where:

\( Q \) — Total BTU load (BTU/hour)
\( A \) — Area (square feet)
\( \text{BTU/ft}^2 \) — BTU requirement per square foot (BTU/hour·ft²)

Explanation: The area is multiplied by the BTU requirement per square foot to determine the total heating or cooling load.

3. Importance of BTU Calculation

Details: Proper BTU calculation ensures efficient HVAC system sizing, energy efficiency, and comfortable indoor temperatures.

4. Using the Calculator

Tips: Enter the area in square feet and BTU per square foot (default 20 BTU/h·ft² for cooling). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical BTU per square foot value?
A: For cooling: 20 BTU/h·ft²; For heating: 30-40 BTU/h·ft² in cold climates.

Q2: When would I need to adjust the BTU/ft² value?
A: Adjust for room type (kitchens need more), insulation quality, ceiling height, or climate conditions.

Q3: Does this include other factors like windows or insulation?
A: No, this is a basic calculation. For precise needs, consult an HVAC professional.

Q4: How do I convert BTU to tons for AC units?
A: Divide BTU by 12,000 (1 ton = 12,000 BTU/h).

Q5: Should I round up the calculated BTU value?
A: Yes, it's recommended to round up to the nearest standard HVAC unit size.